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Hi. Thank you for reaching out. We are currently undergoing maintenance and IceSat-2 data is unavailable. Our operations department is actively working on this issue and I will update this thread when I have further information.

Thank you for reaching out. NDSI_Snow_Cover is the the snow cover map with cloud and other masks overlaid. The NDSI value is scaled to the 0 - 100 range and was converted to byte from float datatype. All NDSI <= 0 are set to 0. Any pixel failing one or more of the data screens is set to 0 or other n...

MODIS is an optical sensor, which has inherent limitations in observing sea ice and snow. Unlike a passive-microwave sensor, which can detect microwave energy through clouds, MODIS cannot observe the surface when cloud cover is present. MODIS products, therefore, have cloud masks built into the data...

Because MODIS sensors have flown on both the Terra and Aqua satellites, NSIDC offers parallel products derived from MODIS on each satellite. Terra and Aqua products are very similar with a few key differences: Terra launched two years before Aqua, so the Terra record starts earlier, with observation...